Benchmark - compared to std library

[prassee]

It would be good to see benchmarks with std lib such suite would help improve the library. I can help with that if the author of this project is willing to drive the project on this direction.

[bradenaw]

Which comparisons are you hoping to see? There's one already in there for container/tree vs. the map builtin: https://github.com/bradenaw/juniper/blob/main/container/tree/btree_benchmark_test.go

Are there others that'd be helpful?